EXCERPT “I think she’s happy to go out and support folks who have stood up for things that she thinks are important,” said David Axelrod, Mr. Obama’s senior adviser. “But I don’t think she’s eager to jump into the fray in a very political way, and I don’t think she will.” With her husband’s poll numbers sliding, and many Democrats distancing themselves from him, Mrs. Obama, political analysts say, is the White House’s best hope for exciting the party’s lethargic base. “Her favorability is the highest of anybody we’ve got on the Democratic side right now,” said Celinda Lake, a...